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Author: search.filters.author.Trisupakitti, SomsukSubject: search.filters.subject.bio-oil

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    Bio-oil production via fast pyrolysis of cassava residues combined with ethanol and volcanic rock in a free-fall reactor
    (2023-01-01)
    Rueangsan, Koson
    ;
    Heman, Adcha
    ;
    Kraisoda, Pakkip
    ;
    Tasarod, Homhuan
    ;
    Duanguppama, Keyoon
    Pyrolysis of waste biomass to produce usable energy has the potential to, in part, alleviate the consumption of limited fossil fuel resources. We describe bio-oil production via fast pyrolysis of cassava residues, a mostly wasted byproduct of cassava crops. The waste biomass was combined with two readily available additives—volcanic rock and ethanol—in a free fall reactor to generate bio-oil, char and syngas. Using cassava stems as the raw feed-stock we tested pyrolysis reaction temperatures in the range 450–500 °C in a free fall reactor using a N<inf>2</inf> flow. Analysis of the pyrolysis products should little variation in this range, so analyses for the effects of ethanol and volcanic rock as additives were tested at 500 °C. The bio-oil yield ranged between 58 and 60%, char represented 17–19% and gas 21–24%. With volcanic rock, the higher heating value was significantly higher at 23.6 MJ/kg compared to ~19 MJ/kg for cassava alone or added ethanol. Readily available, inexpensive, naturally occuring zeolites in the volcanic rock led to significant extra degradation of the biomass, under the same experimental conditions, leading to this improvement.
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    Fast pyrolysis of Dipterocarpus alatus Roxb and rubber wood in a free-fall reactor
    (2022-01-01)
    Rueangsan, Koson
    ;
    Trisupakitti, Somsuk
    ;
    Senajuk, Watchara
    ;
    Morris, John
    Dipterocarpus alatus Roxb, sometimes called the ‘diesel tree’, because its resin has been reported to run small engines directly, has not been studied as a source of bio-oil from pyrolysis, although considerable waste is generated from furniture making. Here, we compared it with rubber tree waste, using cassava rhizomes (already extensively studied as a bio-oil source) as a reference. Our free-fall pyrolysis system used a conventional cooled condenser, as well as an electrostatic precipator, to capture bio-oil. Total bio-oil yields were: D alatus, 62% w/w of input biomass, cassava 61%, rubber wood and leaves, 59%. The electrostatic precipitator was responsible for ~20% of the total bio-oil yield: adding the precipitator increased overall yield significantly. HHV values wre highest for rubber wood (21–22 MJ/kg), but only slightly lower for D alatus and cassava (19–20 MJ/kg). Small differences in the properties of the bio-oil from both condensers confirmed that different fractions of the oils were collected in the two condensers. Overall, D alatus showed good potential as a high yielding source of bio-mass for pyrolysis.